Chest CT Diagnosis of COVID-19: Accuracy using CO-RADS and CT-Involvement Scoring.

Objectives: Both Reporting and Data System (CO-RADS) and CT-involvement scores (CTIS) have been proposed for evaluation of COVID-19 on chest CT. The purpose of this single-center, retrospective study was to evaluate both scoring systems to diagnose COVID-19 infection in a high-prevalence area.

Materials And Methods: Chest CT datasets (n = 200) and available reverse transcription polymerase chain reaction (RT-PCR) on nasopharyngeal swab were included.

Strain Doping: Reversible Single-Axis Control of a Complex Oxide Lattice via Helium Implantation.

We report on the use of helium ion implantation to independently control the out-of-plane lattice constant in epitaxial La(0.7)Sr(0.3)MnO(3) thin films without changing the in-plane lattice constants.

Understanding Strain-Induced Phase Transformations in BiFeO Thin Films.

Experiments demonstrate that under large epitaxial strain a coexisting striped phase emerges in BiFeO thin films, which comprises a tetragonal-like (') and an intermediate ' polymorph. It exhibits a relatively large piezoelectric response when switching between the coexisting phase and a uniform ' phase. This strain-induced phase transformation is investigated through a synergistic combination of first-principles theory and experiments.

Ferromagnetism and nonmetallic transport of thin-film α-FeSi(2): a stabilized metastable material.

A metastable phase α-FeSi_{2} was epitaxially stabilized on a silicon substrate using pulsed laser deposition. Nonmetallic and ferromagnetic behaviors are tailored on α-FeSi_{2} (111) thin films, while the bulk material of α-FeSi_{2} is metallic and nonmagnetic. The transport property of the films renders two different conducting states with a strong crossover at 50 K, which is accompanied by the onset of a ferromagnetic transition as well as a substantial magnetoresistance.